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From: "Wu, Feng" <feng.wu@intel.com>
To: Paolo Bonzini <pbonzini@redhat.com>,
        "Zhang, Yang Z" <yang.z.zhang@intel.com>,
        Thomas Gleixner <tglx@linutronix.de>, Ingo Molnar <mingo@kernel.org>,
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        Jiang Liu <jiang.liu-VuQAYsv1563Yd54FQh9/CA@public.gmane.org>
CC: "iommu@lists.linux-foundation.org" <iommu@lists.linux-foundation.org>,
        "linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
        KVM list <kvm@vger.kernel.org>, Eric Auger <eric.auger@linaro.org>,
        "Wu, Feng" <feng.wu@intel.com>
Subject: RE: [v3 13/26] KVM: Define a new interface kvm_find_dest_vcpu() for
 VT-d PI
Thread-Topic: [v3 13/26] KVM: Define a new interface kvm_find_dest_vcpu()
 for VT-d PI
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Date: Mon, 22 Dec 2014 11:04:25 +0000
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> -----Original Message-----
> From: Paolo Bonzini [mailto:pbonzini@redhat.com]
> Sent: Monday, December 22, 2014 5:28 PM
> To: Wu, Feng; Zhang, Yang Z; Thomas Gleixner; Ingo Molnar; H. Peter Anvin;
> x86@kernel.org; Gleb Natapov; dwmw2@infradead.org; joro@8bytes.org;
> Alex Williamson; Jiang Liu
> Cc: iommu@lists.linux-foundation.org; linux-kernel@vger.kernel.org; KVM list;
> Eric Auger
> Subject: Re: [v3 13/26] KVM: Define a new interface kvm_find_dest_vcpu() for
> VT-d PI
> 
> 
> 
> On 22/12/2014 05:48, Wu, Feng wrote:
> > Do you mean we don't support Lowest priority interrupts? As I mentioned
> before,
> > Lowest priority interrupts is widely used in Linux, so I think supporting lowest
> priority
> > interrupts is very important for Linux guest OS. Do you have any
> ideas/suggestions about
> > how to support Lowest priority interrupts for PI? Thanks a lot!
> 
> Can you support them only if the destination is a single CPU?

Sorry, I am not quite understand this. I still don't understand the "single CPU" here.
Lowest priority interrupts always have a cpumask which contains multiple CPU.

Thanks,
Feng

> 
> Paolo